diff --git a/fatamorgana/basic.py b/fatamorgana/basic.py
index 8a02a38..b65ffea 100644
--- a/fatamorgana/basic.py
+++ b/fatamorgana/basic.py
@@ -1345,10 +1345,7 @@ def read_point_list(stream: io.BufferedIOBase) -> List[List[int]]:
     elif list_type == 5:
         deltas = [Delta.read(stream).as_list() for _ in range(list_len)]
         if _USE_NUMPY:
-            delta_x, delta_y = zip(*deltas)
-            x = numpy.cumsum(delta_x)
-            y = numpy.cumsum(delta_y)
-            points = list(zip(x, y))
+            points = numpy.cumsum(deltas, axis=0)
         else:
             points = []
             x = 0
diff --git a/fatamorgana/records.py b/fatamorgana/records.py
index 4a6e62e..842f201 100644
--- a/fatamorgana/records.py
+++ b/fatamorgana/records.py
@@ -24,7 +24,10 @@ from .basic import AString, NString, repetition_t, property_value_t, real_t, \
         read_bstring, read_uint, read_sint, read_real, read_repetition, read_interval, \
         write_bstring, write_uint, write_sint, write_real, write_interval, write_point_list, \
         write_property_value, read_bool_byte, write_bool_byte, read_byte, write_byte, \
-        InvalidDataError, PathExtensionScheme
+        InvalidDataError, PathExtensionScheme, _USE_NUMPY
+
+if _USE_NUMPY:
+    import numpy
 
 
 logger = logging.getLogger(__name__)
@@ -2444,7 +2447,12 @@ def dedup_field(record: Record, r_field: str, modals: Modals, m_field: str):
     r = getattr(record, r_field)
     m = getattr(modals, m_field)
     if r is not None:
-        if m is not None and m == r:
+        if _USE_NUMPY and m_field in ('polygon_point_list', 'path_point_list'):
+            equal = numpy.array_equal(m, r)
+        else:
+            equal = m is not None and m == r
+
+        if equal:
             setattr(record, r_field, None)
         else:
             setattr(modals, m_field, r)